US4761316A - Recording medium and method of producing the same - Google Patents

Recording medium and method of producing the same Download PDF

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Publication number
US4761316A
US4761316A US06/799,451 US79945185A US4761316A US 4761316 A US4761316 A US 4761316A US 79945185 A US79945185 A US 79945185A US 4761316 A US4761316 A US 4761316A
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US
United States
Prior art keywords
recording medium
recording
active agent
layer
surface active
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US06/799,451
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English (en)
Inventor
Kazufumi Ogawa
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Assigned to MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. reassignment MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: OGAWA, KAZUFUMI
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/72—Protective coatings, e.g. anti-static or antifriction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
    • B05D1/185—Processes for applying liquids or other fluent materials performed by dipping applying monomolecular layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y10/00—Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y40/00—Manufacture or treatment of nanostructures
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/90—Magnetic feature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31652—Of asbestos
    • Y10T428/31663—As siloxane, silicone or silane

Definitions

  • This invention relates to a recording medium and method of producing the same, and more particularly to forming a protection layer on a recording layer of a recording medium such as magnetic tape, magnetic disc, magnetic card, opto-magnetic disc, optical disc, etc.
  • the conventional technology is explained by reference to a magnetic recording medium as one example of a recording medium.
  • Magnetic recording media are roughly classified into two types, i.e., coating type and deposition type.
  • the coating type magnetic recording medium is generally formed by the following method. Magnetic powder such as Fe 2 O 3 or ⁇ -Fe 2 O 3 having an additive of CO is mixed with polyvinyl, butyral, toluene, methyl isobutyl ketone so that the mixed material becomes a coating agent. Then, the coating agent is applied on a surface of a base of the recording medium by 4 ⁇ 5 ⁇ m thickness.
  • This method has an advantage that production of the recording medium is easy, but has a disadvantage that performance is not enough for use in high density recording since there is a limit to reduce the size of magnetic powder.
  • deposition type has better recording density than that of coating type, but has a problem of durability since magnetic metal layer is exposed on the surface of the recording medium.
  • overcoating is applied on a deposition metal layer of 1000 ⁇ 2000 ⁇ which is formed by use of spattering method or of electron beam, and further, smoothing agent is applied on the deposition metal layer.
  • smoothing agent is applied on the deposition metal layer.
  • overcoating and coating of the smoothing agent of thinner and even thickness are difficult to carry out, the gap between a recording or reading magnetic head and a recording layer is widened so that it is difficult to obtain enough high density recording performance.
  • a principal object of the invention is to provide a recording medium which is capable of providing high density recording performance, and to provide a method of producing such a recording medium.
  • a recording medium which comprises a base body of the recording medium, at least one recording layer formed on the base body, and at least one protection layer formed on the recording layer for protecting the recording layer.
  • the protection layer is made from silane surface active agent and the agent molecules are polymerized to one another and also chemically bonded to the recording layer.
  • a chemical substance of CH 2 ⁇ CH--(CH 2 ) n --SiCl 3 (n: integer) is used as said silane surface active agent.
  • the vinyl groups of the silane surface active agent are bridged to one another by energy beam-irradiation thereto.
  • Fluorine may be added to vinyl groups of the silane surface active agent by processing in plasma including fluorine.
  • Hydroxy group may be added to vinyl groups of said silane surface active agent by use of diborane and alkaline hydrogen peroxide.
  • the recording and protection layers may be formed on both surfaces of the base body.
  • a part of hydrocarbon of said silane surface active agent may be replaced by a functional group of --C.tbd.C--C.tbd.C--.
  • the base body may be made of a material which is optically transparent.
  • the recording medium may be magnetic recording medium, optical recording medium or recording disc.
  • This invention also relates to a method of producing a recording medium which comprises the steps of forming a recording layer on a base body of the recording medium, and forming a protection layer on the recording layer.
  • the protection layer is made from silane surface active agent, and the agent molecules are polymerized to one another and chemically bonded to the recording layer by use of chemical adsorption technique.
  • a chemical substance of CH 2 ⁇ CH--(CH 2 ) n --SiCl 3 (n: integer) is used as the silane surface active agent and vinyl groups of the agent are bridged to one another.
  • the silane surface active agent may be processed in an atmosphere including fluorine plasma gas. After chemical adsorption of the agent is conducted, the recording medium is immersed into diborane and alkaline hydrogen peroxide so that hydroxy groups are added to the vinyl groups of the silane surface active agent, and then, chemical adsorption of another silane surface active agent is conducted.
  • This invention has various advantages, among which are as follows.
  • the recording medium which has a very thin organic film of high density formed on a surface thereof, without pin-holes, of even thickness. Therefore, in case that the recording medium is, for example, a magnetic recording medium, performance of a recording and reproducing magnetic head is improved and noise is reduced.
  • FIG. 1 is a section view of a magnetic recording medium as a first embodiment of the invention
  • FIGS. 2 and 3 show processes for producing the recording medium of the first embodiment
  • FIG. 4 is a section view of a recording medium as a second embodiment of the invention.
  • FIGS. 5 and 6 show processes for producing a recording medium of a third embodiment
  • FIG. 7 is a section view of a recording medium as a fourth embodiment
  • FIGS. 8 and 9 show processes for producing a recording medium of a fifth embodiment
  • FIG. 10 shows a machine for producing the recording medium.
  • FIGS. 1, 2 and 3 show a magnetic recording medium as a first embodiment of the invention.
  • the magnetic recording medium 10, as shown in FIG. 1, is constructed as follows. That is, there is provided a disc plate 12 for magnetic recording use (base of recording medium). Magnetic recording layer 14 (e.g., magnetic metal or magnetic metal oxide such as Fe--Ni, Ni--C 2 , Fe 2 O 3 ) is formed on the disc plate 12 by use of spattering deposition method, etc. Thereafter, silane surface active agent is absorbed to the magnetic recording layer 14 and polymerized to one another by bonding of silicon and oxygen by use of chemical adsorption method so that monomolecular protection film 16, which is produced by the silane surface active agent, is formed.
  • a disc plate 12 for magnetic recording use (base of recording medium).
  • Magnetic recording layer 14 e.g., magnetic metal or magnetic metal oxide such as Fe--Ni, Ni--C 2 , Fe 2 O 3
  • silane surface active agent is absorbed to the magnetic recording layer 14 and polymer
  • silane surface active agent 18 CH 2 ⁇ CH--(CH 2 ) n --SiCl 3 (n: integer, the value of approximately 10 ⁇ 20 is the easiest to handle) is used as shown in FIG. 2.
  • n integer, the value of approximately 10 ⁇ 20 is the easiest to handle
  • n n-hexane, 12% trichloro methane and 8% chloroform which are dissolved by concentration of approximately 2 ⁇ 10 -3 ⁇ 5.0 ⁇ 10 -2 Mol/l.
  • the base of recording medium base 12 on which the magnetic recording layer 14 is formed is immersed in the above-stated solution.
  • bonding 20 of ##STR1## is formed between magnetic recording layer 14 and the silane surface active agent 18 since natural oxide is formed on the metal surface of the magnetic recording layer 14, so that monomolecular protection film 16, which is formed by polymerization of the silane surface active agent, is further formed up to the thickness of 20 ⁇ 30 ⁇ .
  • vinyl group (CH 2 ⁇ CH--) 22 which is located at one end of the silane surface active agent 18, is juxtaposed on the surface of the protection film 16.
  • energy beam 24 such as electron beam, X-ray, ⁇ -ray, ultra violet ray, ion beam, etc. is irradiated on the surface of the protection film 16 so that vinyl groups 22 are bridged (see, 26 in FIG. 3) to one another, and the monomolecular protection film 16 is reinforced and stabilized.
  • FIG. 4 Second embodiment of the invention is shown in FIG. 4.
  • the recording medium of the structure shown in FIG. 2 is processed in an atmosphere of high frequency plasma such as CF 4 which includes fluorine and is of approximately 10 -3 torr.
  • CF 4 which includes fluorine and is of approximately 10 -3 torr.
  • FIGS. 5 and 6 This embodiment is used to slightly increase the thickness of the protection film 16.
  • the recording medium of the structure shown in FIG. 2 is immersed first into a THF solution of diborane--1 Mol/l at room temperature, and then, immersed into a solution of NaOH--0.1 Mol/l and 30% H 2 O 2 .
  • OH groups 30 are added to the vinyl groups on the surface of the protection film 16 as shown in FIG. 5.
  • additional silane surface active agent 32 is added to the surface of the protection film 16 by use of chemical adsorption method.
  • bonding 34 of ##STR2## is formed between the OH groups 30 and trichloro silane groups of the silane surface active agent 32 so that another monomolecular film 36 is formed on the monomolecular film 16.
  • a protection film having the desired thickness can be formed.
  • 38 denotes vinyl group which is located at one end of silane surface active agent 32.
  • the first embodiment is of the recording medium wherein the recording layer is formed on only one surface of the medium
  • the fourth embodiment is of the recording medium wherein the recording layer 14 and protection film 16 are formed on both surfaces of the base 12.
  • FIGS. 8 and 9 Fifth embodiment of the invention is shown in FIGS. 8 and 9.
  • the structure shown in FIG. 8 is almost the same as that shown in FIG. 6.
  • the difference is that diacetylene group (--C.tbd.C--C.tbd.C--) 40 is included in normal chain carbon bonding (--(CH 2 ) n --) of the silane surface active agent 32.
  • energy beam 24 (see, FIG. 9) is irradiated on the surface of the protection film (16+36) so that the diacetylene groups 40 are bonded (see, 42 in FIG. 9) on the whole surface of the medium and the accumulated protection film (16+36) has electric conductivity in the surface direction thereof.
  • acetylene groups, or cyano groups may be used instead of the vinyl group of the silane surface active agent.
  • Dichloro silane group, monochloro silane group or an agent in which both groups are mixed may be used instead of trichloro silane group.
  • FIG. 10 Sixth embodiment is shown in FIG. 10.
  • the recording medium is a magnetic recording tape
  • a tape manufacturing machine shown in FIG. 10 may be used.
  • An uncoated magnetic recording tape 44 which is supplied from supply drum 46 passes through first solution 48 for chemical adsorption, first reaction solution 50, second reaction solution 52 and second solution 54 for chemical adsorption, respectively so that tape 56 having the recording layer and protection film is obtained and taken up by take-up drum 58.
  • 60 denotes a capstan for forming a tape feed path.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Nanotechnology (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Composite Materials (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • Magnetic Record Carriers (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
  • Laminated Bodies (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)
US06/799,451 1984-11-19 1985-11-18 Recording medium and method of producing the same Expired - Lifetime US4761316A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP59243677A JPS61122925A (ja) 1984-11-19 1984-11-19 記録媒体の製造方法
JP59-243677 1984-11-19

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US07/423,636 Expired - Lifetime US4992316A (en) 1984-11-19 1989-10-20 Recording medium and method of producing the same

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Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4985273A (en) * 1988-06-07 1991-01-15 Matsushita Electric Industrial Co., Ltd. Method of producing fine inorganic particles
US4992300A (en) * 1988-05-24 1991-02-12 Matsushita Electric Industrial Co., Ltd. Manufacturing method for a recording medium or a recording head
US4992316A (en) * 1984-11-19 1991-02-12 Matsushita Electric Industrial Co., Ltd. Recording medium and method of producing the same
US5009924A (en) * 1987-10-19 1991-04-23 Energy Sciences Inc. Process to permit improvement of functional properties of polyolefin articles by electron-beam initiated polymerization
US5035782A (en) * 1988-06-28 1991-07-30 Matsushita Electric Industrial Co., Ltd. Method for the formation of monomolecular adsorption films or built-up films of monomolecular layers using silane compounds having an acetylene or diacetylene bond
US5093154A (en) * 1988-09-05 1992-03-03 Matsushita Electric Industrial Co., Ltd. Process for preparing a monomolecular built-up film
US5196227A (en) * 1988-08-05 1993-03-23 Matsushita Electric Industrial Co., Ltd. Method for making optical recording mediums
US5209976A (en) * 1988-07-04 1993-05-11 Matsushita Electric Industrial Co., Ltd. Structure having a surface covered with a monomolecular film
EP0552636A1 (en) * 1992-01-17 1993-07-28 Matsushita Electric Industrial Co., Ltd. Method of manufacturing a recording medium
US5246740A (en) * 1990-01-12 1993-09-21 Matsushita Electric Industrial Co., Ltd. Process for preparing a lamination of organic monomolecular films, and a chemical adsorbent used for the process
US5264731A (en) * 1987-06-25 1993-11-23 Matsushita Electric Industrial Co., Ltd. Method for fabricating semiconductor device
US5286571A (en) * 1992-08-21 1994-02-15 Northwestern University Molecular modification reagent and method to functionalize oxide surfaces
EP0590680A1 (en) * 1992-10-02 1994-04-06 Matsushita Electric Industrial Co., Ltd. Method of manufacturing organic films
US5324566A (en) * 1991-01-23 1994-06-28 Matsushita Electric Industrial Co., Ltd. Water and oil repelling film having surface irregularities and method of manufacturing the same
US5378521A (en) * 1992-09-12 1995-01-03 Matsushita Electric Industrial Co., Ltd. Water-and oil-repelling members and method of manufacturing the same
US5443901A (en) * 1991-02-05 1995-08-22 Matsushita Electric Industrial Co., Ltd. Magnetic recording medium having an adsorbed film of molecules comprising two species of straight carbon chain molecules
US5468551A (en) * 1991-04-30 1995-11-21 Matsushita Electric Industrial Co., Ltd. Functional laminated chemically adsorbed films
US5571622A (en) * 1991-07-26 1996-11-05 Matsushita Electric Industrial Co., Ltd. Water- and oil repellent substrate and method of treatment
US5578340A (en) * 1991-01-28 1996-11-26 Matsushita Electric Industrial Co., Ltd. Medical member and method of manufacturing the same
US5587241A (en) * 1995-06-01 1996-12-24 Vaughan; Gerald L. Mineral fibers and whiskers exhibiting reduced mammalian cell toxicity, and method for their preparation
US5587209A (en) * 1990-11-06 1996-12-24 Matsushita Electric Industrial Co., Ltd. Fluorocarbon-based polymer lamination coating film and method of manufacturing the same
US5629088A (en) * 1991-07-23 1997-05-13 Matsushita Electric Industrial Co., Ltd. Hydrophilic substrate and method of manufacturing the same
US5695836A (en) * 1991-04-30 1997-12-09 Matsushita Electric Industrial Co., Ltd. Antistatic film and method of manufacturing the same
US5780148A (en) * 1992-11-12 1998-07-14 Matsushita Electric Industrial Co., Ltd. Hydrophilic thin film and method of manufacturing the same
US20020043332A1 (en) * 1999-06-24 2002-04-18 Fujitsu Limited Method of manufacturing magnetic recording medium and the magnetic recording medium
US6379801B1 (en) 1998-12-07 2002-04-30 Seagate Technology, Llc Silane derivatized lubricants for magnetic recording media
US6485785B1 (en) 1999-08-31 2002-11-26 Matsushita Electric Industrial Co., Ltd. Coating film, and method and apparatus for producing the same

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Publication number Priority date Publication date Assignee Title
JPS63220420A (ja) * 1987-03-09 1988-09-13 Matsushita Electric Ind Co Ltd 記録媒体およびその製造方法
JP2532577B2 (ja) * 1988-05-24 1996-09-11 松下電器産業株式会社 記録媒体の製造方法
JPH0725889B2 (ja) * 1989-03-03 1995-03-22 松下電器産業株式会社 単分子吸着膜の累積方法
JP2912694B2 (ja) * 1990-09-07 1999-06-28 松下電器産業株式会社 記録再生装置
US5268211A (en) * 1991-01-17 1993-12-07 Matsushita Electric Industrial Co., Ltd. Optical recording medium
CA2071124A1 (en) * 1991-06-19 1992-12-20 Utami Yonemura Resin article having anti-static property
US6589641B1 (en) 1998-06-04 2003-07-08 Seagate Technology Llc Thin films of crosslinked fluoropolymer on a carbon substrate
US6617011B2 (en) 1999-05-07 2003-09-09 Seagate Technology Llc Elastomeric lubricants for magnetic recording media
US6680079B1 (en) 2000-06-02 2004-01-20 Seagate Technology Llc Planarization and corrosion protection of patterned magnetic media
US6849304B1 (en) 2001-03-16 2005-02-01 Seagate Technology Llc Method of forming lubricant films
WO2004002735A1 (ja) * 2002-06-27 2004-01-08 Tdk Corporation 複合ハードコート層付き物体及び複合ハードコート層の形成方法
JP4504772B2 (ja) 2004-09-27 2010-07-14 株式会社ニフコ 燃料タンクの給油管
JP2008004200A (ja) * 2006-06-23 2008-01-10 Fujifilm Corp マスター記録媒体の製造方法及び、製造されたマスター記録媒体を用いた磁気転写方法、磁気記録媒体の製造方法
JP5138476B2 (ja) 2008-06-27 2013-02-06 豊田合成株式会社 給油装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4368239A (en) * 1979-08-06 1983-01-11 Sony Corporation Magnetic recording medium
US4429024A (en) * 1981-08-14 1984-01-31 Shin-Etsu Chemical Co., Ltd. Method of making antistatic magnetic recording tapes and recording tapes
US4434210A (en) * 1980-07-03 1984-02-28 Sony Corporation Magnetic recording medium
JPS60121519A (ja) * 1983-12-05 1985-06-29 Tdk Corp 磁気記録媒体
US4583145A (en) * 1983-02-05 1986-04-15 International Business Machines Corporation Apparatus comprising a lubricant-coated magnetic disc and a magnetic head, and method of making said apparatus
US4599266A (en) * 1982-06-18 1986-07-08 Tdk Corporation Magnetic recording medium
US4601950A (en) * 1984-09-10 1986-07-22 Shin-Etsu Chemical Co., Ltd. Magnetic recording medium and manufacturing method thereof

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5746329A (en) * 1980-09-05 1982-03-16 Nec Corp Production of magnetic storage medium
JPS5883328A (ja) * 1981-11-12 1983-05-19 Fuji Photo Film Co Ltd 磁気記録媒体
JPS61122925A (ja) * 1984-11-19 1986-06-10 Matsushita Electric Ind Co Ltd 記録媒体の製造方法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4368239A (en) * 1979-08-06 1983-01-11 Sony Corporation Magnetic recording medium
US4434210A (en) * 1980-07-03 1984-02-28 Sony Corporation Magnetic recording medium
US4429024A (en) * 1981-08-14 1984-01-31 Shin-Etsu Chemical Co., Ltd. Method of making antistatic magnetic recording tapes and recording tapes
US4599266A (en) * 1982-06-18 1986-07-08 Tdk Corporation Magnetic recording medium
US4583145A (en) * 1983-02-05 1986-04-15 International Business Machines Corporation Apparatus comprising a lubricant-coated magnetic disc and a magnetic head, and method of making said apparatus
JPS60121519A (ja) * 1983-12-05 1985-06-29 Tdk Corp 磁気記録媒体
US4601950A (en) * 1984-09-10 1986-07-22 Shin-Etsu Chemical Co., Ltd. Magnetic recording medium and manufacturing method thereof

Cited By (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4992316A (en) * 1984-11-19 1991-02-12 Matsushita Electric Industrial Co., Ltd. Recording medium and method of producing the same
US5264731A (en) * 1987-06-25 1993-11-23 Matsushita Electric Industrial Co., Ltd. Method for fabricating semiconductor device
US5009924A (en) * 1987-10-19 1991-04-23 Energy Sciences Inc. Process to permit improvement of functional properties of polyolefin articles by electron-beam initiated polymerization
US4992300A (en) * 1988-05-24 1991-02-12 Matsushita Electric Industrial Co., Ltd. Manufacturing method for a recording medium or a recording head
US4985273A (en) * 1988-06-07 1991-01-15 Matsushita Electric Industrial Co., Ltd. Method of producing fine inorganic particles
US5035782A (en) * 1988-06-28 1991-07-30 Matsushita Electric Industrial Co., Ltd. Method for the formation of monomolecular adsorption films or built-up films of monomolecular layers using silane compounds having an acetylene or diacetylene bond
US5209976A (en) * 1988-07-04 1993-05-11 Matsushita Electric Industrial Co., Ltd. Structure having a surface covered with a monomolecular film
US5445886A (en) * 1988-07-04 1995-08-29 Matsushita Electric Industrial Co., Ltd. Structure having a surface covered with a monomolecular film
US5196227A (en) * 1988-08-05 1993-03-23 Matsushita Electric Industrial Co., Ltd. Method for making optical recording mediums
US5324548A (en) * 1988-08-05 1994-06-28 Matsushita Electric Industrial Co., Ltd. Method for making optical recording mediums
US5093154A (en) * 1988-09-05 1992-03-03 Matsushita Electric Industrial Co., Ltd. Process for preparing a monomolecular built-up film
US5246740A (en) * 1990-01-12 1993-09-21 Matsushita Electric Industrial Co., Ltd. Process for preparing a lamination of organic monomolecular films, and a chemical adsorbent used for the process
US5587209A (en) * 1990-11-06 1996-12-24 Matsushita Electric Industrial Co., Ltd. Fluorocarbon-based polymer lamination coating film and method of manufacturing the same
US5324566A (en) * 1991-01-23 1994-06-28 Matsushita Electric Industrial Co., Ltd. Water and oil repelling film having surface irregularities and method of manufacturing the same
US5578340A (en) * 1991-01-28 1996-11-26 Matsushita Electric Industrial Co., Ltd. Medical member and method of manufacturing the same
US5443901A (en) * 1991-02-05 1995-08-22 Matsushita Electric Industrial Co., Ltd. Magnetic recording medium having an adsorbed film of molecules comprising two species of straight carbon chain molecules
US5695836A (en) * 1991-04-30 1997-12-09 Matsushita Electric Industrial Co., Ltd. Antistatic film and method of manufacturing the same
US5871815A (en) * 1991-04-30 1999-02-16 Matsushita Electric Industrial Co., Ltd. Antistatic film and method of manufacturing the same
US5770266A (en) * 1991-04-30 1998-06-23 Matsushita Electric Industrial Co., Ltd. Functional laminated chemically absorbed films and methods of manufacturing the same
US5468551A (en) * 1991-04-30 1995-11-21 Matsushita Electric Industrial Co., Ltd. Functional laminated chemically adsorbed films
US5629088A (en) * 1991-07-23 1997-05-13 Matsushita Electric Industrial Co., Ltd. Hydrophilic substrate and method of manufacturing the same
US5804252A (en) * 1991-07-26 1998-09-08 Matsushita Electric Industrial Co., Ltd. Water- and oil repellent substrate and method of treatment
US5571622A (en) * 1991-07-26 1996-11-05 Matsushita Electric Industrial Co., Ltd. Water- and oil repellent substrate and method of treatment
US5296263A (en) * 1992-01-07 1994-03-22 Matsushita Electric Industrial Co., Ltd. Method of manufacturing a recording medium
EP0552636A1 (en) * 1992-01-17 1993-07-28 Matsushita Electric Industrial Co., Ltd. Method of manufacturing a recording medium
US5366762A (en) * 1992-01-17 1994-11-22 Matsushita Electric Industrial Co., Ltd. Method of manufacturing a recording medium
US5286571A (en) * 1992-08-21 1994-02-15 Northwestern University Molecular modification reagent and method to functionalize oxide surfaces
US5378521A (en) * 1992-09-12 1995-01-03 Matsushita Electric Industrial Co., Ltd. Water-and oil-repelling members and method of manufacturing the same
US5424098A (en) * 1992-10-02 1995-06-13 Matsushita Electric Industrial Co., Ltd. Method of manufacturing organic films using organic compound and metallic compound
EP0590680A1 (en) * 1992-10-02 1994-04-06 Matsushita Electric Industrial Co., Ltd. Method of manufacturing organic films
US5780148A (en) * 1992-11-12 1998-07-14 Matsushita Electric Industrial Co., Ltd. Hydrophilic thin film and method of manufacturing the same
US5587241A (en) * 1995-06-01 1996-12-24 Vaughan; Gerald L. Mineral fibers and whiskers exhibiting reduced mammalian cell toxicity, and method for their preparation
US6379801B1 (en) 1998-12-07 2002-04-30 Seagate Technology, Llc Silane derivatized lubricants for magnetic recording media
US6551703B1 (en) 1998-12-07 2003-04-22 Seagate Technology Llc Silane derivatized lubricants for magnetic recording media
US20020043332A1 (en) * 1999-06-24 2002-04-18 Fujitsu Limited Method of manufacturing magnetic recording medium and the magnetic recording medium
US20040206450A1 (en) * 1999-06-24 2004-10-21 Fujitsu Limited Method of manufacturing magnetic recording medium and the magnetic recording medium
US6878398B2 (en) 1999-06-24 2005-04-12 Fujitsu Limited Method of manufacturing magnetic recording medium and the magnetic recording medium
US6890585B2 (en) * 1999-06-24 2005-05-10 Fujitsu Limited Method of manufacturing magnetic recording medium and the magnetic recording medium
US6485785B1 (en) 1999-08-31 2002-11-26 Matsushita Electric Industrial Co., Ltd. Coating film, and method and apparatus for producing the same

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US4992316A (en) 1991-02-12
JPH022221B2 (enrdf_load_stackoverflow) 1990-01-17
JPS61122925A (ja) 1986-06-10

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